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Tue, 9 Jun 2026 08:58:44 +0000 Message-ID: <44f409a6-ce8b-4fde-a86c-b1ecfb307bfb@arm.com> Date: Tue, 9 Jun 2026 09:58:43 +0100 User-Agent: Mozilla Thunderbird Subject: Re: [PATCH v3] coresight: etm3x: Fix cntr_val_show() to match cntr_val_store() behavior To: Kuan-Wei Chiu Cc: James Clark , mike.leach@linaro.org, alexander.shishkin@linux.intel.com, gregkh@linuxfoundation.org, mathieu.poirier@linaro.org, leo.yan@arm.com, Al.Grant@arm.com, jserv@ccns.ncku.edu.tw, marscheng@google.com, ericchancf@google.com, milesjiang@google.com, nickpan@google.com, coresight@lists.linaro.org, linux-arm-kernel@lists.infradead.org, linux-kernel@vger.kernel.org, stable@vger.kernel.org References: <20251202082613.3265761-1-visitorckw@gmail.com> <3bec7ceb-61a8-4b38-a794-02ee2fc9e68c@linaro.org> Content-Language: en-US From: Suzuki K Poulose In-Reply-To: Content-Type: text/plain; charset=UTF-8; format=flowed Content-Transfer-Encoding: 7bit X-ClientProxiedBy: PA7P264CA0322.FRAP264.PROD.OUTLOOK.COM (2603:10a6:102:395::6) To PAWPR08MB10975.eurprd08.prod.outlook.com (2603:10a6:102:46e::7) MIME-Version: 1.0 X-MS-TrafficTypeDiagnostic: PAWPR08MB10975:EE_|AS2PR08MB10180:EE_|AM4PEPF00027A6A:EE_|AM8PR08MB6546:EE_ X-MS-Office365-Filtering-Correlation-Id: 1dec6991-e16e-4e59-e6c4-08dec6057822 X-LD-Processed: f34e5979-57d9-4aaa-ad4d-b122a662184d,ExtAddr,ExtAddr x-checkrecipientrouted: true NoDisclaimer: true X-MS-Exchange-SenderADCheck: 1 X-MS-Exchange-AntiSpam-Relay: 0 X-Microsoft-Antispam-Untrusted: BCL:0;ARA:13230040|1800799024|366016|376014|7416014|18002099003|6133799003|22082099003|4143699003|11063799006|3023799007|56012099006; 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X-MS-Exchange-AntiSpam-MessageData-ChunkCount: 1 X-MS-Exchange-AntiSpam-MessageData-0: 5CQbulxAPTNdb7jVM0EfWHpnir5fqf9gsb78lZ4NOgnELzBdlLs+IDpgReOuQ50ijqjjCyPTDEJf3sJw5MY3dyOMIl6ek+YjsgdPK/HLQgasrgkmVl6gA8Gr94vO7ICvtX3gup5+M2eRHUxd+8LEY+qHzIMl8OLNVXIItXNz+MKVezI219ZchssEJMZ0SfiRMDMOaFxPeKhMu9xdmPuwokySDbEH/TJ+nf31ZAKGBq/xWJZ/gMosqoJ6uB7E06FwdSeQkG8OnMPtNxbg8x1a0wsMS9FZSr8aX/dX1h1iSxRmPOI3HVAURAaAb2HSqJS1WfHnk3eBV/pcsuWL5VkJroYjVa/66L+daP2ekHAjS6LpVnvPllLKGcb8NMZUK4dASt3gCUYwREN2j/fYoL40fU91wq5HTpNSvW0QaD40fKukTBpBM9uBe51XPVEt/+Sy X-OriginatorOrg: arm.com X-MS-Exchange-CrossTenant-OriginalArrivalTime: 09 Jun 2026 08:59:52.4922 (UTC) X-MS-Exchange-CrossTenant-Network-Message-Id: 1dec6991-e16e-4e59-e6c4-08dec6057822 X-MS-Exchange-CrossTenant-Id: f34e5979-57d9-4aaa-ad4d-b122a662184d X-MS-Exchange-CrossTenant-OriginalAttributedTenantConnectingIp: TenantId=f34e5979-57d9-4aaa-ad4d-b122a662184d;Ip=[4.158.2.129];Helo=[outbound-uk1.az.dlp.m.darktrace.com] X-MS-Exchange-CrossTenant-AuthSource: AM4PEPF00027A6A.eurprd04.prod.outlook.com X-MS-Exchange-CrossTenant-AuthAs: Anonymous X-MS-Exchange-CrossTenant-FromEntityHeader: HybridOnPrem X-MS-Exchange-Transport-CrossTenantHeadersStamped: AM8PR08MB6546 X-CRM114-Version: 20100106-BlameMichelson ( TRE 0.9.0 (BSD) ) MR-646709E3 X-CRM114-CacheID: sfid-20260609_100017_640840_B1414654 X-CRM114-Status: GOOD ( 24.05 ) X-BeenThere: linux-arm-kernel@lists.infradead.org X-Mailman-Version: 2.1.34 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Sender: "linux-arm-kernel" Errors-To: linux-arm-kernel-bounces+linux-arm-kernel=archiver.kernel.org@lists.infradead.org On 08/06/2026 17:55, Kuan-Wei Chiu wrote: > Hi Suzuki, > > On Fri, Apr 03, 2026 at 04:57:59PM +0800, Kuan-Wei Chiu wrote: >> Hi Suzuki, >> >> On Mon, Feb 02, 2026 at 09:33:59AM +0000, Suzuki K Poulose wrote: >>> Hello >>> >>> On 02/02/2026 05:09, Kuan-Wei Chiu wrote: >>>> On Tue, Dec 02, 2025 at 09:26:19AM +0000, James Clark wrote: >>>>> >>>>> >>>>> On 02/12/2025 8:26 am, Kuan-Wei Chiu wrote: >>>>>> The cntr_val_show() function was intended to print the values of all >>>>>> counters using a loop. However, due to a buffer overwrite issue with >>>>>> sprintf(), it effectively only displayed the value of the last counter. >>>>>> >>>>>> The companion function, cntr_val_store(), allows users to modify a >>>>>> specific counter selected by 'cntr_idx'. To maintain consistency >>>>>> between read and write operations and to align with the ETM4x driver >>>>>> behavior, modify cntr_val_show() to report only the value of the >>>>>> currently selected counter. >>>>>> >>>>>> This change removes the loop and the "counter %d:" prefix, printing >>>>>> only the hexadecimal value. It also adopts sysfs_emit() for standard >>>>>> sysfs output formatting. >>>>>> >>>>>> Fixes: a939fc5a71ad ("coresight-etm: add CoreSight ETM/PTM driver") >>>>>> Cc: stable@vger.kernel.org >>>>>> Signed-off-by: Kuan-Wei Chiu >>>>>> --- >>>>>> Build test only. >>>>>> >>>>>> Changes in v3: >>>>>> - Switch format specifier to %#x to include the 0x prefix. >>>>>> - Add Cc stable >>>>>> >>>>>> v2: https://lore.kernel.org/lkml/20251201095228.1905489-1-visitorckw@gmail.com/ >>>>>> >>>>>> .../hwtracing/coresight/coresight-etm3x-sysfs.c | 15 ++++----------- >>>>>> 1 file changed, 4 insertions(+), 11 deletions(-) >>>>>> >>>>>> diff --git a/drivers/hwtracing/coresight/coresight-etm3x-sysfs.c b/drivers/hwtracing/coresight/coresight-etm3x-sysfs.c >>>>>> index 762109307b86..b3c67e96a82a 100644 >>>>>> --- a/drivers/hwtracing/coresight/coresight-etm3x-sysfs.c >>>>>> +++ b/drivers/hwtracing/coresight/coresight-etm3x-sysfs.c >>>>>> @@ -717,26 +717,19 @@ static DEVICE_ATTR_RW(cntr_rld_event); >>>>>> static ssize_t cntr_val_show(struct device *dev, >>>>>> struct device_attribute *attr, char *buf) >>>>>> { >>>>>> - int i, ret = 0; >>>>>> u32 val; >>>>>> struct etm_drvdata *drvdata = dev_get_drvdata(dev->parent); >>>>>> struct etm_config *config = &drvdata->config; >>>>>> if (!coresight_get_mode(drvdata->csdev)) { >>>>>> spin_lock(&drvdata->spinlock); >>>>>> - for (i = 0; i < drvdata->nr_cntr; i++) >>>>>> - ret += sprintf(buf, "counter %d: %x\n", >>>>>> - i, config->cntr_val[i]); >>>>>> + val = config->cntr_val[config->cntr_idx]; >>>>>> spin_unlock(&drvdata->spinlock); >>>>>> - return ret; >>>>>> - } >>>>>> - >>>>>> - for (i = 0; i < drvdata->nr_cntr; i++) { >>>>>> - val = etm_readl(drvdata, ETMCNTVRn(i)); >>>>>> - ret += sprintf(buf, "counter %d: %x\n", i, val); >>>>>> + } else { >>>>>> + val = etm_readl(drvdata, ETMCNTVRn(config->cntr_idx)); >>>>>> } >>>>>> - return ret; >>>>>> + return sysfs_emit(buf, "%#x\n", val); >>>>>> } >>>>>> static ssize_t cntr_val_store(struct device *dev, >>>>> >>>>> Reviewed-by: James Clark >>>>> >>>> Thanks for the review! >>>> Is there anything else I need to do for this fix to land? >>> >>> Thanks for the patch, I will queue this for the next release (v7.1). >>> >> Just a gentle ping. >> >> Since the v7.1 merge window is presumably opening in about a week, I >> noticed this patch isn't in linux-next yet and wanted to send a quick >> reminder. Thanks. >> > This patch still applies cleanly on top of linux-next. > I suspect this patch may have fallen through the cracks. > Would you still be willing to pick it up? Apologies, it did. I will pick this up, if we have sufficient fixes, I might send it as fixes for v7.2, otherwise , queue it for v7.3 Once again, apologies. Suzuki > > Regards, > Kuan-Wei